the requirement of the size/resolution of an graphic display should be given by the application. The fundamental physical limitation of the SC1x5 is:24-bit parallel display port, supports max 85 MHz display clock and up to WXGA (1366 x 768 @60Hz) resolution.

There are different possibilities to connect a LCD on SC145. All Solutions with their own advantages & disadvantagesa) as you mentioned via SPI with a single-chip SOC driver (ILI9341). +: Open Source samples for Arduino available. Cheap break out boards for Arduino available. -: ILI9341 with max. 320x240. Limited speed of the SPI.

c) with GC-touch 4.10 (via Ethernet – peer2peer, alternative with I2C)+: With Ethernet fast. Flexible Design possible (expansion). RTOS Support available (GCLIB)-: more expensive as b). From stock only as 4.3”.